Bacterial fossils and microbial dolomite in Triassic stromatolites
By Edoardo Perri, M. Tucker. 2007
135 citations recorded by the source corpus.
Triassic stromatolitic dolomite from Italy preserves mineralized bacterial remains, one of the first unequivocal identifications of such structures in the geological record. They consist of empty spheroids ∼1.0 µm diameter resembling coccoid bacteria, and smaller, 150–400 nm, objects interpreted as dwarf bacterial forms, occurring within and between syn-sedimentary dolomite crystals. Moreover, gently folded sheets, 100–200 nm thick and several micrometers long, form a sub-polygonal network reminiscent of EPS (extracellular polymeric substance). Their granular-textured surfaces suggest bacterial degradation of original organic matter. These features confirm a biological origin for the stromatolites, as in modern microbial mats, and the preserved original geochemical signatures indicate early precipitation of Mg-carbonates induced through microbial sulfate-reducing metabolic activities.
Subfields: Environmental Chemistry, Geophysics, Paleontology
View Paper: https://www.semanticscholar.org/paper/4db8885afe407219935b937c267fb14f9b733189
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Citations in the corpus
- Carbonate and silicate biomineralization in a hypersaline microbial mat (Mesaieed sabkha, Qatar): Roles of bacteria, extracellular polymeric substances and viruses (2018, background): “…has been documented as a common biosignature of modern and ancient microbial carbonate (López-García et al., 2005; Benzerara et al., 2006, 2010; Perri & Tucker, 2007; Bontognali et al., 2008; Sànchez-Romàn et al., 2008; Manzo et al., 2012; Perri & Spadafora, 2011; Perri et al., 2012a,b;…”
- Microbial biomineralization processes forming modern Ca:Mg carbonate stromatolites (2010, background): “Journal compilation 2009 International Association of Sedimentologists, Sedimentology, 57, 27–40 2006; Bontognali et al., 2008) and in ancient microbial carbonates (Perri & Tucker, 2007).”